the cynthia mcfadden and bill weir in new york city and terry moran in washington, this is "nightline," july 20th, 2011. >> good evening. well, it's not only hot, it's deadly hot. at least 22 people have died so far in the heat wave currently sweeping the country. and conditions will only get more dangerous in the coming days, forecasters say. factors such as relative humidity of more than 0% and little or no wind are making temperatures that are already high feel downright unbearable. here's abc's john donvan with a snapshot of our sizzling states. >> reporter: it's all over the map this heat. 106 degrees in wichita. 98 in milwaukee. oklahoma city, 106. 99 in chicago. and while it seems to be going nowhere, this heat, it is, in fact, slowly sliding east, which is why the map, literally the map, has been in the headlines almost everywhere. hot colors we're not used to seeing.